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Global Climate Modeling Computation

  • One piece is modeling the fluid flow in the atmosphere

    • Solve Navier-Stokes equations

    • Roughly 100 Flops per grid point with 1 minute timestep

  • Computational requirements:

    • To match real-time, need 5 x 1011 flops in 60 seconds = 8 Gflop/s

    • Weather prediction (7 days in 24 hours) 56 Gflop/s

    • Climate prediction (50 years in 30 days) 4.8 Tflop/s

    • To use in policy negotiations (50 years in 12 hours) 288 Tflop/s

  • To double the grid resolution, computation is 8x to 16x

  • State of the art models require integration of atmosphere,

ocean, sea-ice, land models, plus possibly carbon cycle, geochemistry and more

  • Current models are coarser than this

COMP 422, Spring 2008 (V.Sarkar)

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